JPWO2005123629A1 - Manufacturing method of phosphoric acid fertilizer using incinerated ash and its manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing a stable phosphate fertilizer at low cost by adjusting a change in content of a phosphorus component. [Solution] Using sludge incineration ash as a main material, auxiliary materials such as magnesium, calcium and potash are added and heated in a melting furnace to separate into molten metal and molten slag. To produce phosphate fertilizer. Fluctuation is calculated based on the measurement data obtained by analyzing the total phosphoric acid concentration of the sludge incineration ash of the main raw material, and the ratio of addition of high phosphorus content waste in the auxiliary raw material after grasping the total phosphoric acid concentration in the incineration ash And an addition device for adding a secondary raw material such as a high phosphorus content waste to the main raw material in accordance with the phosphoric acid concentration determined by the output of the arithmetic device before the raw material is melted. . [Selection] Figure 1

Description

  The present invention relates to a method and an apparatus for producing phosphate fertilizer using sludge incineration ash or sewage, human waste, livestock manure, and the like as raw materials.

  Conventionally, a method for producing phosphorus fertilizer using sludge incineration ash has been proposed. For example, Japanese Laid-Open Patent Publication No. 2001-80979 uses a sludge incineration ash containing a large amount of phosphorus component as a raw material, and additives such as magnesium oxide, calcium oxide, and phosphoric acid component are added to the raw material to create a mixed raw material And the manufacturing method of the phosphoric acid fertilizer which fuse | melts this mixed raw material, is rapidly cooled after that, slags, and grind | pulverizes after that is proposed. Japanese Patent Application Laid-Open No. 2003-112988 also proposes a method for producing phosphate fertilizer from sludge incineration ash. In the method according to the publication, coke, magnesium oxide, calcium oxide and potassium oxide are added to sludge incinerated ash having a high phosphorus component concentration and heated in a melting furnace, and the molten metal and molten slag are separated into two parts in the melting furnace. A method for producing a granular slag in which the molten slag is selectively discharged to a granulation tank and rapidly cooled to form a granular slag having a high phosphorus component and a metal component removed has been proposed.

  In addition to the above-mentioned Japanese Laid-Open Patent Publication, a method for producing phosphate fertilizer from sludge incineration ash has been proposed, but the method is almost the same. The phosphorus fertilizer manufacturing method by a prior art is planning that many phosphorus components are contained in raw material incineration ash. That is, the merit of using incinerated ash with a low phosphorus component content to produce phosphorus fertilizer is small. However, the content (total phosphoric acid concentration) of the phosphorus component contained in the sludge is not constant and changes throughout the year. It also varies depending on other causes (for example, rainfall, regionality, etc.). In the conventional method for producing phosphate fertilizer, the content of the phosphorus component is regarded as constant and a high phosphorus additive is added, so that the concentration of soluble phosphate in the product varies. If the incineration ash with low phosphorus content is thrown away and only the incineration ash with high phosphorus content is to be used because of the high price of high phosphorus additives, it is necessary to separate them. The problem of how to treat incinerated ash with low phosphorus content must be solved. Moreover, when an expensive phosphorus ore etc. are added to incineration ash with little content of a phosphorus component, the subject that the cost of a phosphate fertilizer will become high arises.

  As described above, the conventional method for producing phosphorus fertilizer using sludge incineration ash has some difficulties, but the present invention solves these problems and adjusts the change in the content of phosphorus components. In order to produce a stable and stable phosphate fertilizer at a low cost, the phosphorus content of the main raw material incineration ash is measured prior to charging into the melting furnace. An object is to provide a method and an apparatus for producing a safe phosphorus fertilizer by adding and mixing inexpensive high phosphorus-containing waste not only to ore to increase the concentration of soluble phosphoric acid in the product to a substantially constant concentration. And

  That is, the present invention uses a sludge incinerated ash containing a phosphorus component as a main raw material, adds a secondary material containing a magnesium, calcium and / or potassium component and a reducing agent, and heats and melts at 1350 to 1450 ° C. in a melting furnace. In the method of manufacturing phosphoric acid fertilizer by separating the molten metal and molten slag into two layers in the melting furnace and letting the molten slag flow out, and then rapidly cooling to the molten slag; adding the auxiliary material and the reducing agent Prior to measuring the total phosphoric acid concentration of the main raw material incineration ash, if the total phosphoric acid concentration is lower than the predetermined target product concentration, obtain the addition ratio of the high phosphorus content before the melting treatment, By adding the required amount of phosphorus-containing waste or phosphorus ore selected from bone meal, fish meal, and chicken manure into the melting furnace, a product with 6-25% soluble phosphoric acid in the product is produced. How to make phosphate fertilizer It is.

  In addition, the present invention uses sludge incinerated ash as a main raw material, adds auxiliary materials containing magnesium, calcium and / or potassium components and a reducing agent, and heats them in an electric resistance melting furnace to form molten metal and molten slag. In an apparatus that separates and produces molten slag and rapidly cools it to produce phosphate fertilizer; prior to the addition of the auxiliary material, grasp the total phosphoric acid concentration of the main raw material incineration ash and determine the concentration of the target product Means for calculating the addition ratio of the high phosphorus content, a container storing the high phosphorus content, and an addition device for adding the high phosphorus content to the raw material before the melting treatment; The arithmetic unit is characterized in that when the total phosphorus content of the main raw material is lower than the target product concentration input by the input means, the difference is obtained to determine the addition ratio of the auxiliary raw material. To the phosphate fertilizer production equipment It is hunt thing.

In order to solve the above-mentioned problems, the present inventor conducted the following experiments and examinations.
(1) Annual variation survey of components in incineration ash

It is known that the composition of sewage sludge incineration ash varies depending on the season and treatment plant. Therefore, as a result of conducting an investigation twice a month on the seasonal variation of the composition of the raw material incineration ash in the predetermined treatment plant, particularly the phosphorus pentoxide (hereinafter referred to as “phosphoric acid”) concentration, as shown in the graph of FIG. The main component of the raw incineration ash tended to change over the years. According to FIG. 3, the total phosphoric acid concentration (or total phosphoric acid content, indicated by TP ₂ O ₅ ) tends to be higher in winter and lower in summer. In addition, in May, it has been high all silicon oxide concentration (T-SiO ₂₎ in September. Furthermore, there is an inverse correlation between the total phosphoric acid concentration and the total silicon oxide concentration. This is considered to be because in May and September when there is a lot of rain, earth and sand mainly composed of silicon oxide (SiO ₂ ) flows into the sewage along with rainwater. Moreover, it is considered that the total phosphoric acid content is lowered even after heavy rains such as typhoons. In addition to FIG. 3, similar results have been obtained in survey data by the Tokyo Sewerage Bureau.

  (2) Soluble phosphoric acid concentration by adding phosphoric acid source

Table 1 shows the total concentration of each main component for the maximum, minimum and average total phosphoric acid concentrations in the incinerated ash. Table 2 shows the proportion of the phosphorus component assumed in the product. As can be understood from Tables 1 and 2, when the total phosphoric acid concentration is small, the soluble phosphoric acid concentration (C—P ₂ O ₅ ) is also low. Therefore, when the total phosphoric acid concentration is low, it is necessary to add an appropriate additive having a high phosphoric acid content.

Tables 3 and 4 show the incineration ash composition (Table 3) and the product when the product is manufactured by adding calcium phosphate using the raw material incineration ash whose main component is close to the incineration ash composition which was the minimum value of total phosphoric acid. The analysis result (Table 4) of a fertilizer component is shown. Table 4 shows that the insoluble phosphonic acid concentration of the product manufactured by using incinerated ash having a low phosphoric acid concentration and adding calcium phosphate is 19.8%. As shown in Table 2, the expected concentration of soluble phosphoric acid in the product when incinerated ash having the maximum total phosphorus concentration is used as a raw material is 19.3%. From this result, even when incineration ash with a low total phosphoric acid concentration is used as a raw material, the same soluble phosphoric acid as when a high total phosphoric acid concentration incinerated ash is used as a raw material by adding an additive of a high phosphoric acid source It has been found that products with concentrations can be produced. The charged raw material is heated and melted at 1350 to 1450 ° C. in a melting furnace. However, when the temperature is 1350 ° C. or lower, the solubility of the cake is insufficient. The scattering loss cannot be ignored.

(3) Selection of incinerated ash and high phosphoric acid source to be added and determination of addition ratio

Therefore, in order to select a high phosphate source to be added and to determine the addition ratio, calcium phosphate (Ca ₃ (PO ₄ ) ₂ as a high phosphate source for a plurality of sewage sludge incineration ash having different total phosphate concentration contents. ), And the analysis results when a product is produced by adding either phosphate ore or meat-and-bone meal incineration ash will be described below. Table 5 shows the main components of the incinerated ash raw materials (A to D) used for the samples and the main components of calcium phosphate (Ca ₃ (PO ₄ ) ₂ ), phosphorus ore, and meat-and-bone meal incinerated ash that can be used as a high phosphate source. . Incineration ash A is incineration ash having the lowest total phosphoric acid concentration (see Table 2), and incineration ash B to D in Table 5 are incineration ash having a lower total phosphoric acid concentration than that.

Table 6 shows a mixed raw material in which any one of calcium phosphate, phosphate ore, and meat-and-bone meal incineration ash is added to the raw material sludge incineration ash as a high phosphoric acid source, and magnesium oxide (MgO) and calcium oxide (CaO) are further added. The mixing ratio of samples 1 to 6 is shown. Samples 1 to 3 are mixed raw materials to which calcium phosphate is added, sample 4 is a mixed raw material to which phosphate ore is added, and samples 5 and 6 are mixed raw materials to which meat and bone powder incinerated ash is added. Sample 5 is a case where the addition amount of meat-and-bone meal incineration ash is increased, and Sample 6 is a case where the addition amount of meat-and-bone meal incineration ash is slightly reduced. Moreover, the mixing ratio of incinerated ash is over 50% in any sample.

Table 7 shows the soluble phosphoric acid concentration (%) when products were produced from Samples 1 to 6 in Table 6. This product is manufactured by a conventional method in which the mixed raw material is heated in a melting furnace, the molten metal and molten slag are separated, the molten slag is extracted, and then rapidly cooled to produce phosphorus fertilizer. As apparent from Table 7, even when meat and bone powder incinerated ash is used as an additive, a product having a high soluble phosphate concentration is obtained as in the case of using calcium phosphate or phosphate ore as an additive.

As is clear from comparison between Table 7 and Table 4, even if a raw incineration ash having a low total phosphoric acid concentration was used, if a high phosphoric acid source was added, a raw incineration ash having a high total phosphoric acid concentration was used. It has been found that a product with a high soluble phosphate concentration can be obtained. Moreover, these experiments revealed that meat-and-bone meal incinerated ash can be used as a high phosphoric acid source to be added and the ratio of addition.
(4) Confirmation of safety

Sewage sludge incineration ash may contain heavy metals. Therefore, when fertilizer is produced from incinerated ash, it is necessary that the product does not contain heavy metals. Although Patent Document 2 also describes that it is safe, the following experiment was performed in order to confirm quantitative safety. Table 8 shows the mixing ratio of the mixed raw materials in which magnesium oxide and calcium oxide (quick lime) are added as additives to the incinerated ash obtained from two different treatment plants, and FIG. 4 is processed in a melting furnace in a reducing atmosphere. The heavy metal behavior (migration rate of heavy metal components before and after treatment) is shown.

  As can be understood from FIG. 4, most of the fertilizer components phosphorus (P), magnesium (Mg), calcium (Ca), silicon (Si), and potassium (K) are transferred into the slag. Most of iron (Fe) and nickel (Ni) are removed as metal. Aluminum (Al) and chromium (Cr) have a high rate of remaining in the slag in terms of balance, but chromium has a content equal to or less than that of commercial fertilizers, and harm is also observed in fertilization tests on plants. Therefore, good growth results are obtained. In addition, there is little absorption and transfer into the plant body. Most of the heavy metals that are harmful to the human body, zinc (Zn), arsenic (As), cadmium (Cd), and lead (Pb), are transferred to the gas phase and removed from the product. From the above examinations, it can be said that products made from phosphorus fertilizer using incinerated ash are safe.

  According to the present invention, the phosphorus content in the sludge incineration ash is measured, and an inexpensive high phosphoric acid raw material is added as an additive based on the difference in concentration from the target product, so that a stable phosphorus fertilizer Can be produced at low cost. According to claim 4, since waste such as bone meal is used as a high phosphorus content additive, the amount of waste such as bone meal can be reduced, and the manufacturing cost can be reduced. The effect that it can be obtained.

FIG. 1 is a cross-sectional view showing an outline of the phosphate fertilizer production apparatus of the present invention. In FIG. 1, the raw material sludge incineration ash 10 is partly collected as a sample 11 for measuring the content of the main component (particularly, the total phosphoric acid content (TP ₂ O ₅ )), most of which is added. It is mixed with the agents 12 to 15 and put into the electric resistance melting furnace 20. As additives, magnesium oxide (MgO) 12, calcium oxide (CaO) 13 and high phosphorus content waste 15 such as meat-and-bone meal incinerated ash and coke 14 for making the inside of the melting furnace 20 into a reducing atmosphere are used. Magnesium oxide and calcium oxide contained in the incinerated ash are often contained at a substantially constant rate throughout the year (see FIG. 3). Accordingly, magnesium oxide 12, calcium oxide 13 and coke 14 are constant as additives. It is added at a ratio of For example, the addition may be performed by interrupting a pipe from each additive hopper in the middle of the carrying path.

  On the other hand, the total phosphoric acid content varies greatly depending on the season, and the change in content directly affects the change in the amount of soluble phosphoric acid. It is necessary to control the amount of phosphorus component added. Meat-and-bone meal incinerated ash or the like (hereinafter referred to as “meat-and-bone meal”) is stored in the container 18 as the high phosphorus-containing waste 15. As the high phosphorus content waste 15, a high phosphorus content waste containing bone meal, fish meal, chicken manure, bone meal or the like is used. A discharge mechanism 19 is provided at the bottom of the container 18 for discharging and adding a predetermined amount. Further, the addition control device 17 determines the addition ratio of meat-and-bone meal necessary for the current incineration ash from the data obtained by analyzing the sample 11, and outputs a control signal 16 to the release mechanism 19 to release a predetermined amount of meat-and-bone meal. .

  FIG. 2 shows a block diagram of the addition control device 17. In FIG. 2, the addition control device 17 includes a target product concentration input means 31, a sample analysis means 32, a data storage device 33, a total phosphoric acid content determination means 34, an addition rate determination means 35, a control amount output means 36, and a central control device. 37.

  The target product concentration input means 31 calculates the minimum soluble phosphoric acid concentration of the target product (or the total phosphoric acid concentration necessary for the target product) based on annual seasonal fluctuations, market demand trends, laws and regulations (fertilizer control law), etc. Determine and input the data. For example, the minimum soluble phosphoric acid concentration of the target product is a value that exceeds legal regulations, and the profit is maximized considering the selling price, the total phosphoric acid concentration of all raw materials in the previous fiscal year, and the price of meat and bone meal It may be determined as follows. The sample analysis means 32 analyzes the main component (or only the total phosphoric acid concentration) of the sample 11. The data storage device 33 stores relational data between the dissolved phosphoric acid concentration and the total phosphoric acid concentration, and other necessary data. The total phosphoric acid content determining means 34 determines the total phosphoric acid content of the target product from the relational data stored in the data storage device 33, and obtains the total phosphoric acid concentration and the difference of the sample. The addition rate determination means 35 obtains the ratio of meat-and-bone meal added to the current incineration ash. The control amount output means 36 determines the control amount of the obtained ratio, controls the release mechanism 19 and releases a predetermined amount of meat-and-bone meal.

  In FIG. 1, a melting furnace 20 is provided with a raw material charging machine 21 and a raw material charging port 22, from which raw materials are charged into the furnace. Moreover, the lining 29 which forms a fusion | melting space is affixed on the center inner side of the furnace body 23, and the furnace interior is formed. Electrodes 24 and 25 are provided on the upper and lower sides. The charged raw material 26 is heated and melted. The molten raw material is separated into molten slag 27 and molten metal 28 and coexists in the furnace in a two-liquid separated state. The molten metal 28 is discharged from the metal discharge port 30. On the other hand, the molten slag is discharged from the slag discharge port 41 and flows into the granulation tank 43 by the water flow trough 42. Water 44 is stretched in the granulating tank 43, and the slag that flows into the water becomes granular 45 and accumulates at the bottom of the granulating tank 43. In addition, harmful substances such as lead, zinc, arsenic and cadmium contained in the incineration ash are vaporized and discharged to a processing apparatus (not shown) from a gas discharge port 46 provided at the head of the furnace body 23.

  The above embodiment operates as follows. First, additives of magnesium oxide 12 and calcium oxide 13 and coke 14 are added to the raw material incinerated ash 10 at a certain ratio. At the same time, a high phosphorus content waste such as meat-and-bone meal stored in the container 18 or a high phosphorus additive 15 mixed with calcium phosphate or phosphate ore is added at a rate determined by the addition controller 17. The mixed raw material to which these additives 12 to 15 are added is charged into the raw material charging machine 21 and is charged into the melting furnace 20 through the charging port 22. The mixed raw material charged into the furnace is heated and melted by the electrodes 24 and 25. When melted, the mixed raw material is separated into molten slag 27 and molten metal 28, and at the same time, a gas (not shown) is generated in the melting process. In the melting furnace, molten slag 27 and molten metal 28 accumulate in a separated state. The gas is discharged from the gas discharge port 46 to a processing apparatus (not shown). The molten metal 28 accumulated in the furnace is discharged from the metal discharge port 30. Further, the molten slag 27 is discharged from the slag discharge port 41, flows into the granulation tank 43 by the water flow trough 42, becomes granular slag 45, and accumulates at the bottom of the granulation tank 43. The granular slag 45 is taken out and finely crushed for commercialization. At the time of crushing, cooling water having a water temperature of 20 to 30 ° C. is sprayed on slag that is usually carried by a conveyor (not shown), or slag is crushed into particles by cooling with water in a granulating tank. For reasons such as savings, it is processed at 40-80 ° C. using a slag granulator as shown in FIG.

  FIG. 5 is a schematic front view showing the arrangement relationship of each part of the slag granulator. Molten slag 27 flowing down from the slag discharge port 46 of the melting furnace is introduced into the water granulating tank 50 through a water flow trough 47. Since the temperature of the cooling water (industrial water) 51 in the granulation tank 50 is always increased because the molten slag is high temperature, the control valve 49 is operated to inject low-temperature water into the granulation tank 50 from the water injection pipe 48. . While the inside of the tank is stirred by the stirrer 53, the water that has absorbed the heat and raised the temperature is discharged from the drain pipe 54. The drain pipe 54 has a pump 55 and a control valve 56. A branch pipe 57 is provided on the delivery side of the pump 55, and a cooling coil (or heat exchanger) 58 and a filter 59 are interposed in the middle of the branch pipe 57. A part is returned to the granulation tank 50. The temperature of the cooling water 51 is measured by a thermometer 61 attached to the drain pipe 54, the temperature measurement value is input to the controller 60, and the liquid level of the granulating tank 50 is measured by a water level meter 62, and the data Is also input to the controller 60. The controller 60 controls the control valves 49 and 55 by calculating the temperature and water level of the cooling water in the granulating tank to be set values. By doing so, the granular slag 52 crushed by keeping the cooling water in the range of 40 to 80 ° C., for example, around 60 ° C., is deposited.

  As described above, according to the present embodiment, when the total phosphoric acid concentration in the sludge incineration ash is low, an appropriate amount of high phosphorus-containing waste is added, so that the soluble phosphoric acid concentration exceeds the target product concentration throughout the year. The product is maintained at a stable value, and a stable product can be produced. Further, since waste such as bone meal is used as a high phosphorus additive to be added, the production cost is reduced.

  Next, the fertilization effect test of the product of the present invention will be described.

A fertilizer with a solubility of 18.63% was applied to Hiroshima mana, and a fertilization effect test was conducted using a 0.02 m ² Wagner pot (a / 5000). As test plots, a total of five test plots were set up, including a phosphate-free plot with no phosphate fertilizer added, a standard and double-volume plot of product, and a standard and double-volume plot of control fertilizer. Ream. Black soil is used as the test soil, and 0.7 g each of ammonium sulfate and potassium chloride are applied as component amounts (N and K ₂ O) to all test sections, and commercially available molten phosphorus fertilizer is used for the control fertilizer section. (Cu-soluble P ₂ O ₅ : 19.96%) In the test plot, 0.7 g of the above product was applied as phosphoric acid (P ₂ O ₅ ) and cultivated in a glass greenhouse for 27 days. Obviously the growth was good and almost the same as the control fertilizer (molten phosphorus fertilizer). Yield index is a value control fertilizer value taken as 100, the absorption index of the P ₂ O _5, which was 100 to control fertilizer P ₂ O ₅ content in the plants harvested in fresh weight after harvesting. The product clearly has a better yield index and absorption index of P ₂ O ₅ than the phosphate-free zone, and the yield index and absorption index of P ₂ O ₅ are almost the same as those of the molten phosphorus fertilizer compared to the control fertilizer. It became.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the illustrated example, and even if there is a design change or the like without departing from the gist of the present invention, Included in the invention.

It is sectional drawing which shows the outline of this invention phosphate fertilizer manufacturing apparatus. The block diagram of the auxiliary material addition control apparatus in FIG. 1 is shown. It is a graph which shows the fluctuation | variation state of the main component composition in sludge incineration ash. It is a figure which shows the behavior of the heavy metal at the time of processing raw material incineration ash with the melting furnace made into the reducing atmosphere. It is a figure which shows the arrangement | positioning relationship of each part of a slag granulation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sludge incineration ash 11 Sample 12-14 Additive 15 High phosphorus additive 16 Control signal 17 Addition control apparatus 18 Storage container of high phosphorus containing material 19 Release mechanism 20 Melting furnace 21 Raw material input machine 22 Raw material input port 23 Furnace body 24, 25 Electrode 26 Charged mixed raw material 27 Molten slag 28 Molten metal 29 Lining 30 Metal outlet 31 Target product concentration setting device 32 Sample analyzer 33 Data storage device 34 Total phosphoric acid content determining means
35 Addition rate determining means 36 Control amount output device 37 Central control device 41 Slag discharge port 42 Water trough 43 Water granulation tank 44 Water storage 45 Granules 45 Granular slag 46 Slag discharge port 47 Water trough 48 Injection pipe 49 Control valve 50 Hydrocracking tank 51 Cooling water 52 Granular slag 53 Stirrer 54 Drain pipe
55 Pump 56 Control valve 57 Branch pipe
58 Cooling coil 59 Filter 60 Controller
61 Thermometer 62 Water Level Meter

Claims (7)

Using sludge incineration ash containing phosphorus component as the main raw material, adding auxiliary material containing magnesium, calcium and / or potassium component and reducing agent, heating and melting at 1350-1450 ° C in a melting furnace, In a method for producing phosphoric acid fertilizer by separating molten metal and molten slag into two layers and letting molten slag flow out, and then rapidly cooling the molten slag;
Prior to the addition of the auxiliary material and the reducing agent, the total phosphoric acid concentration of the main raw material incineration ash is measured, and when the total phosphoric acid concentration is lower than the predetermined target product concentration, the high phosphorus content before melting treatment The manufacturing method of the phosphoric acid fertilizer characterized by manufacturing the product which made 6-25% of soluble phosphoric acid in a product by calculating | requiring the addition ratio of and adding in a melting furnace.   The method for producing phosphate fertilizer according to claim 1, wherein the molten slag discharged from the melting furnace is crushed while being rapidly cooled at a water temperature of 20 to 30 ° C.   The method for producing phosphate fertilizer according to claim 1, wherein the molten slag discharged from the melting furnace is crushed while rapidly cooling at a water temperature of 40 to 80 ° C.   The method for producing phosphate fertilizer according to claim 1, wherein the high phosphorus content is a phosphorus-containing waste or phosphorus ore selected from bone meal, fish meal, and chicken dung. Using sludge incineration ash as the main raw material, adding auxiliary materials containing magnesium, calcium and / or potassium components and a reducing agent, heating in an electric resistance melting furnace, separating into molten metal and molten slag, In an apparatus for producing phosphate fertilizer by quenching molten slag;
Prior to the addition of the secondary material, means for determining the concentration of the target product by analyzing the total phosphoric acid concentration of the main raw material incineration ash, calculation means for calculating the addition ratio of the high phosphorus content, and storing the high phosphorus content And an addition device for adding a secondary raw material containing a high phosphorus content prepared in advance before the melting treatment into the main raw material,
When the total phosphorus content of the main raw material is lower than the target product concentration input to the calculating means, the arithmetic device obtains the difference and determines the addition ratio of the auxiliary raw material. Phosphate fertilizer manufacturing equipment.   The phosphate fertilizer manufacturing apparatus according to claim 5, wherein the high phosphorus content is a phosphorus-containing waste or phosphorus ore selected from bone meal, fish meal, and chicken manure.   The target product phosphoric acid concentration is determined by determining the minimum phosphoric acid concentration of the target product based on annual seasonal fluctuations, market demand trends, etc., and determining the total phosphate concentration required for the target product. The phosphate fertilizer manufacturing apparatus according to claim 5,

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